Nice TR. I would like to add that there was mad confusion over where to begin the hike above the 1st box where we put-in. Regardless of what the sign at the first marked parking lot says, that's the lot you want and is indeed the trailhead for the shortcut.
Possible names for the 1st sieve include: Bovine Grinder, No Country For Old Men, Dead Cow Sieve, and The Drain.
Robin may have another river feature named after him given he forcefully slammed the entrance rock at Weeping Wall sideways, then proceeded to lose his stern-mounted Go-Pro & swim; "Robin's Rock".
Scenery is truly outstanding & the shoreless, non-portageble drops are a novelty.
Oh yea, least I forget, there is a mandatory safety meeting at one of the beaches directly AFTER the 2nd box in preparation for the undisputed crux of the run, the 8 miles of breathtaking, sandstone desert walls which happen to ricochet the pitch of a whistled bootle quite nicely.
This happenstance may come in handy if you need to signal the troops who may scatter due to drunkenness, lethargy, or simply a need to spend a few minutes alone, away from foul-mouthed, fellow dirtbags.
Video made of the trip: